where is iac on 2003 sierra

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Download P0505 (14) DTC P0505: Idle Control System Malfunction NOTE: If DTC P1519 is stored at same time as DTC P0505, troubleshoot DTC P1519 first, then recheck for DTC P0505. 1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on. 2. Check the engine speed at idle with no-load conditions: headlights, blower fan, rear window defogger, radiator fan, and air conditioner off. Is the engine running at 730+/-50 rpm? 3. Disconnect the idle air control (IAC) valve 3P connector. Does the engine speed increase or fluctuate? 4. Turn the ignition switch OFF. 5. Remove the intake air duct from the throttle body. 6. Start the engine and let it idle. 7. Put your finger on the lower port (A) in the throttle body. Does the engine speed drop below 780 rpm? YES – Intermittent failure, system is OK at this time.?… Read More

Download FORD: 1998-2003 E SERIES 1999-2003 SUPER DUTY F SERIES 2000-2003 EXCURSION, F-650, F-750 This article supersedes TSB 03-21-50 to update the WARNING service procedure and illustration. DO NOT REMOVE OR ATTEMPT TO REPAIR A LEAK AT THE PLUG PICTURED IN LOWER LEFT ISSUE CORNER OF FIGURE 1, OR DAMAGE TO THE Some 1998-2003 E-Series, 1999-2003 Super Duty, PUMP WILL RESULT. 2000-2003 Excursion, and 2000-2003 F650/750 1998-2003 E-SERIES HIGH PRESSURE OIL vehicles equipped with a 7.3L Diesel engine may PUMP ACCESS PROCEDURE (DISASSEMBLY) exhibit an oil leak at the high pressure oil pump outlet fittings and/or end plug (see Figure 1). The 1. Remove the Intake Air Resonator. For leak may appear to be a rear main crankshaft seal, additional information, refer to Section 303-12 in oil pan gasket, or other engine oil leak due to the the appropriate Workshop Manual. drain hole machined in the crankcase valley which allows any oil in the valley to run down the back of 2.… Read More

Download FORD: 2003-2006 Expedition LINCOLN: 2003-2006 Navigator ISSUE Some 2003-2006 Expedition and Navigator vehicles equipped with an air suspension may exhibit an air suspension height sensor linkage arm disengaging from the suspension ball stud or height sensor rotating arm. This concern typically occurs with the rear sensor (Figure 1) but may occur with the front sensors as well. If this occurs, the symptom will typically be the vehicle leaning to one side, the vehicle sitting too low/high, a harsh ride, and/or an inoperative air suspension. In addition, this concern may result in diagnostic trouble code (DTC) C1725 (air suspension front pneumatic failure) or C1726 (air suspension rear pneumatic failure). ACTION When a linkage arm becomes disengaged, do not re-attach the arm and do not replace the sensor unless broken. Instead, install a revised linkage arm on all three (3) sensor assemblies, even if they have not detached from the ball stud.… Read More

Download SYMPTOM The vehicle shudders or vibrates between 35 and 40 mph. PROBABLE CAUSE The torque converter is faulty. CORRECTIVE ACTION Replace the torque converter, or the torque converter and the transmission, and update the PCM with the HDS. NOTE: You must update the PCM to complete the repair. PARTS INFORMATION Torque Converter: P/N 26000-RDJ-315. DIAGNOSIS 1. To confirm the client’s complaint, test-drive the vehicle on a smooth road, preferably with a slight incline. Set the cruise control between 35 and 40 mph, and monitor the engine rpm using the vehicle’s tachometer, or use the HDS to take a snapshot of the engine rpm. 2. If the engine speed fluctuates several hundred rpm while maintaining a constant vehicle speed, disconnect the EGR valve and retest the vehicle. •If the fluctuation is gone, refer to the EGR troubleshooting in the service manual. •If the engine rpm still fluctuates, and the transmission does not have any other symptoms (shifting problems, slipping, transmission DTCs) go to step 3.… Read More